Abstract—
We have studied water vapor sorption properties of close-packed opal structures made up of monodisperse spherical silica particles 150 to 350 nm in diameter. The results attest to polymolecular water adsorption followed by capillary condensation in meso- and micropores within the structure-forming particles. The maximum adsorption value, ~0.13 g of H2O per gram of dry SiO2, essentially coincides with the specific volume of inner pores in the particles. The annealing temperature has been shown to influence the adsorption properties and effective refractive index of the opal photonic crystals. The refractive index of dry and adsorbed water-filled opal structures has been determined as a function of annealing temperature.
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ACKNOWLEDGMENTS
This work was supported by the Russian Foundation for Basic Research, project nos. 16-29-11702 ofi_m and 16-02-00755.
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Masalov, V.M., Zotov, A.K., Dolganov, P.V. et al. Effect of Heat Treatment on Water Vapor Adsorption by Opal Structures and Their Effective Refractive Index. Inorg Mater 55, 143–148 (2019). https://doi.org/10.1134/S0020168519020067
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DOI: https://doi.org/10.1134/S0020168519020067